Oh my goodness! I have been starring at this blank page for days, pondering TRUTH! What is it? Can Truth become an untruth?
My mind is spinning!
One of the statements I have said over and over is:
Truth is truth whether it is believed or not.
TRUTH is an absolute. Truth is defined as: the actual state of the matter; conformity with fact or reality; verify. 
This wonderful quote says it for me.
If truth were based on perspective, it would have to be changeable. Based on fact, absolute fact, it would be unchanging.
God is unchanging. Where is the security or assurance if the source of all thought, strength, and power were ever changing?
“… otherwise the universe would be a chaos not a cosmos.” Haanel Week 21, Introduction
Constant change would result in chaos.  There is no harmony in chaos. There is no peace. There is no silence.
To answer the title question, truth cannot become an untruth.
Enough said.
Hi Louise, so, nice to read ur blog post about ‘truth’! It reminds me on David R. Hawkins! Do u know him? I’m just discovering his approach about truth! It is AMAZING, AMAZING, ABSOLUTELY AMAZING! And so nicely intersecting with the MKE. I send u, lovely truth seeker, also a powerful quote from him: “Facts are accumulated by effort, but truth reveals itself effortlessly”
Dear Amanda, Thank you for your kind words. I am not familiar with David Hawkins. Looking him up and reading about him, I am intrigued. Thank you for pointing me in his direction and for his wonderful quote. Blessings!!!